CVE-2026-72339 (GCVE-0-2026-72339)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:42
VLAI
Title
qede: fix off-by-one in BD ring consumption on build_skb failure
Summary
In the Linux kernel, the following vulnerability has been resolved: qede: fix off-by-one in BD ring consumption on build_skb failure qede_rx_build_skb() and qede_tpa_rx_build_skb() do not check for a NULL return from qede_build_skb(). When it returns NULL under memory pressure, the functions still consume a BD from the ring before returning NULL. The callers then recycle additional BDs, resulting in one extra BD being consumed (off-by-one). This desynchronizes the BD ring, which can corrupt DMA page reference counts and lead to SLUB freelist corruption. Commit 4e910dbe3650 ("qede: confirm skb is allocated before using") added a NULL check inside qede_build_skb() to prevent a NULL pointer dereference, but did not address the missing NULL checks in the callers, making this off-by-one reachable. Fix this by adding NULL checks for the return value of qede_build_skb() in both qede_rx_build_skb() and qede_tpa_rx_build_skb(), returning NULL immediately before any BD ring manipulation.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < ecc05d4b20220a09c9c69584fc46ca55248a374a (git)
Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < 07be8b8adf91b7ada4c3dacce064d572a6066421 (git)
Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < 1624aa100c0b218181aa74e3696a389b509298cb (git)
Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < 0bf78df2d3ecb1f4964ff42a7327d25845955153 (git)
Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < 814a5edac8c9fc04051808d5faaa93768e989281 (git)
Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < b066420e57f3402a52c998678b4678252ac9bb63 (git)
Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < 982d6d6bc059c5dff37a2201c2f08c14bcfcbd20 (git)
Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/qlogic/qede/qede_fp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ecc05d4b20220a09c9c69584fc46ca55248a374a",
              "status": "affected",
              "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
              "versionType": "git"
            },
            {
              "lessThan": "07be8b8adf91b7ada4c3dacce064d572a6066421",
              "status": "affected",
              "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
              "versionType": "git"
            },
            {
              "lessThan": "1624aa100c0b218181aa74e3696a389b509298cb",
              "status": "affected",
              "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
              "versionType": "git"
            },
            {
              "lessThan": "0bf78df2d3ecb1f4964ff42a7327d25845955153",
              "status": "affected",
              "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
              "versionType": "git"
            },
            {
              "lessThan": "814a5edac8c9fc04051808d5faaa93768e989281",
              "status": "affected",
              "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
              "versionType": "git"
            },
            {
              "lessThan": "b066420e57f3402a52c998678b4678252ac9bb63",
              "status": "affected",
              "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
              "versionType": "git"
            },
            {
              "lessThan": "982d6d6bc059c5dff37a2201c2f08c14bcfcbd20",
              "status": "affected",
              "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
              "versionType": "git"
            },
            {
              "lessThan": "a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f",
              "status": "affected",
              "version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/qlogic/qede/qede_fp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.18"
            },
            {
              "lessThan": "4.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nqede: fix off-by-one in BD ring consumption on build_skb failure\n\nqede_rx_build_skb() and qede_tpa_rx_build_skb() do not check for a\nNULL return from qede_build_skb(). When it returns NULL under memory\npressure, the functions still consume a BD from the ring before\nreturning NULL. The callers then recycle additional BDs, resulting in\none extra BD being consumed (off-by-one). This desynchronizes the BD\nring, which can corrupt DMA page reference counts and lead to SLUB\nfreelist corruption.\n\nCommit 4e910dbe3650 (\"qede: confirm skb is allocated before using\")\nadded a NULL check inside qede_build_skb() to prevent a NULL pointer\ndereference, but did not address the missing NULL checks in the\ncallers, making this off-by-one reachable.\n\nFix this by adding NULL checks for the return value of\nqede_build_skb() in both qede_rx_build_skb() and\nqede_tpa_rx_build_skb(), returning NULL immediately before any BD ring\nmanipulation."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bug is in the qede NIC RX fastpath reached when remote Ethernet frames are received, hardware posts completion queue entries, and NAPI runs qede_poll() -\u003e qede_rx_int() -\u003e qede_rx_process_cqe()/qede_tpa_start() into qede_rx_build_skb() or qede_tpa_rx_build_skb().\nAC:L - An attacker can reliably trigger build_skb() NULL returns by flooding the interface with frames larger than rx_copybreak (256 bytes) to exhaust GFP_ATOMIC skb slab allocations, then the off-by-one BD consumption desynchronizes the ring without races or victim-specific state.\nPR:N - No local account, capability, or authentication is required; any unauthenticated remote host that can send IP/Ethernet traffic to a server using a Marvell/QLogic FastLinQ qede NIC can hit the vulnerable RX/TPA handlers.\nUI:N - Exploitation requires no victim interaction beyond normal network operation; packet reception, MSI-X interrupt handling, and NAPI polling process attacker-supplied frames automatically in kernel context.\nS:U - The flaw corrupts kernel heap metadata (DMA page refcounts and SLUB freelists) within the host kernel security boundary; it does not by itself cross VM, container, or IOMMU isolation boundaries.\nC:H - BD ring desynchronization corrupts DMA page reference counts and can corrupt SLUB freelists; this class of kernel heap corruption is exploitable for arbitrary kernel memory reads and information disclosure beyond a simple crash.\nI:H - SLUB freelist corruption from mismatched BD ring consumption enables arbitrary kernel memory writes and control-flow hijacking primitives, supporting local privilege escalation or arbitrary code execution in kernel context.\nA:H - Reference-count and SLUB corruption from the desynchronized BD ring can cause kernel BUG/oops/panic or a wedged RX datapath, resulting in complete loss of host availability on affected systems."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:42:57.907Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ecc05d4b20220a09c9c69584fc46ca55248a374a"
        },
        {
          "url": "https://git.kernel.org/stable/c/07be8b8adf91b7ada4c3dacce064d572a6066421"
        },
        {
          "url": "https://git.kernel.org/stable/c/1624aa100c0b218181aa74e3696a389b509298cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/0bf78df2d3ecb1f4964ff42a7327d25845955153"
        },
        {
          "url": "https://git.kernel.org/stable/c/814a5edac8c9fc04051808d5faaa93768e989281"
        },
        {
          "url": "https://git.kernel.org/stable/c/b066420e57f3402a52c998678b4678252ac9bb63"
        },
        {
          "url": "https://git.kernel.org/stable/c/982d6d6bc059c5dff37a2201c2f08c14bcfcbd20"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f"
        }
      ],
      "title": "qede: fix off-by-one in BD ring consumption on build_skb failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72339",
    "datePublished": "2026-08-15T05:55:46.480Z",
    "dateReserved": "2026-08-09T03:40:39.920Z",
    "dateUpdated": "2026-08-17T05:42:57.907Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-72339",
      "date": "2026-08-27",
      "epss": "0.00745",
      "percentile": "0.52157"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-72339\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:07.150\",\"lastModified\":\"2026-08-17T06:18:37.623\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nqede: fix off-by-one in BD ring consumption on build_skb failure\\n\\nqede_rx_build_skb() and qede_tpa_rx_build_skb() do not check for a\\nNULL return from qede_build_skb(). When it returns NULL under memory\\npressure, the functions still consume a BD from the ring before\\nreturning NULL. The callers then recycle additional BDs, resulting in\\none extra BD being consumed (off-by-one). This desynchronizes the BD\\nring, which can corrupt DMA page reference counts and lead to SLUB\\nfreelist corruption.\\n\\nCommit 4e910dbe3650 (\\\"qede: confirm skb is allocated before using\\\")\\nadded a NULL check inside qede_build_skb() to prevent a NULL pointer\\ndereference, but did not address the missing NULL checks in the\\ncallers, making this off-by-one reachable.\\n\\nFix this by adding NULL checks for the return value of\\nqede_build_skb() in both qede_rx_build_skb() and\\nqede_tpa_rx_build_skb(), returning NULL immediately before any BD ring\\nmanipulation.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/qlogic/qede/qede_fp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8a8633978b842c88fbcfe00d4e5dde96048f630e\",\"lessThan\":\"ecc05d4b20220a09c9c69584fc46ca55248a374a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a8633978b842c88fbcfe00d4e5dde96048f630e\",\"lessThan\":\"07be8b8adf91b7ada4c3dacce064d572a6066421\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a8633978b842c88fbcfe00d4e5dde96048f630e\",\"lessThan\":\"1624aa100c0b218181aa74e3696a389b509298cb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a8633978b842c88fbcfe00d4e5dde96048f630e\",\"lessThan\":\"0bf78df2d3ecb1f4964ff42a7327d25845955153\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a8633978b842c88fbcfe00d4e5dde96048f630e\",\"lessThan\":\"814a5edac8c9fc04051808d5faaa93768e989281\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a8633978b842c88fbcfe00d4e5dde96048f630e\",\"lessThan\":\"b066420e57f3402a52c998678b4678252ac9bb63\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a8633978b842c88fbcfe00d4e5dde96048f630e\",\"lessThan\":\"982d6d6bc059c5dff37a2201c2f08c14bcfcbd20\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a8633978b842c88fbcfe00d4e5dde96048f630e\",\"lessThan\":\"a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/qlogic/qede/qede_fp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/07be8b8adf91b7ada4c3dacce064d572a6066421\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0bf78df2d3ecb1f4964ff42a7327d25845955153\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1624aa100c0b218181aa74e3696a389b509298cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/814a5edac8c9fc04051808d5faaa93768e989281\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/982d6d6bc059c5dff37a2201c2f08c14bcfcbd20\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b066420e57f3402a52c998678b4678252ac9bb63\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ecc05d4b20220a09c9c69584fc46ca55248a374a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-18T23:56:55+00:00",
      "cve": "CVE-2026-72339",
      "id": "CVE-2026-72339",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: qede: fix off-by-one in BD ring consumption on build_skb failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72339.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.